http://www.medievalandtudorships.org

Researchers at the University of Southampton have undertaken the mammoth task of mapping the complex network of merchant trading routes and ports that operated during the late medieval and Tudor periods. The project team analysed 50,000 ship movements between more than 600 ports in England and Wales from AD 1400-1580, scouring heaps of data from custom accounts, navy payrolls, and national ship surveys.